| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | David Rowley <dgrowleyml(at)gmail(dot)com> |
| Cc: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Jakub Wartak <jakub(dot)wartak(at)enterprisedb(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Peter Eisentraut <peter(at)eisentraut(dot)org>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Performance degradation on concurrent COPY into a single relation in PG16. |
| Date: | 2023-07-25 16:06:35 |
| Message-ID: | 20230725160635.goyh4c6kc5nephnd@awork3.anarazel.de |
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| Lists: | pgsql-hackers |
Hi,
On 2023-07-25 08:50:19 -0700, Andres Freund wrote:
> One idea I had was to add a fastpath that won't parse all strings, but will
> parse the strings that we would generate, and fall back to the more general
> variant if it fails. See the attached, rough, prototype:
>
> fix_COPY_DEFAULT.patch + fastpath.patch:
> 746.971
>
> fix_COPY_DEFAULT.patch + fastpath.patch + isdigit.patch:
> 715.570
>
> Now, the precise contents of this fastpath are not yet clear (wrt imul or
> not), but I think the idea has promise.
Btw, I strongly suspect that fastpath wants to be branchless SSE when it grows
up.
Greetings,
Andres Freund
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